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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
      7 
      8 #include "base/memory/scoped_vector.h"
      9 #include "base/process/process.h"
     10 #include "base/sync_socket.h"
     11 #include "base/time/time.h"
     12 #include "media/audio/audio_input_controller.h"
     13 #include "media/audio/audio_parameters.h"
     14 #include "media/base/audio_bus.h"
     15 
     16 #if defined(OS_POSIX)
     17 #include "base/file_descriptor_posix.h"
     18 #endif
     19 
     20 namespace base {
     21 class SharedMemory;
     22 }
     23 
     24 namespace content {
     25 // A AudioInputController::SyncWriter implementation using SyncSocket. This
     26 // is used by AudioInputController to provide a low latency data source for
     27 // transmitting audio packets between the browser process and the renderer
     28 // process.
     29 class AudioInputSyncWriter : public media::AudioInputController::SyncWriter {
     30  public:
     31   explicit AudioInputSyncWriter(base::SharedMemory* shared_memory,
     32                                 int shared_memory_segment_count,
     33                                 const media::AudioParameters& params);
     34 
     35   virtual ~AudioInputSyncWriter();
     36 
     37   // media::AudioInputController::SyncWriter implementation.
     38   virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE;
     39   virtual void Write(const media::AudioBus* data,
     40                      double volume,
     41                      bool key_pressed) OVERRIDE;
     42   virtual void Close() OVERRIDE;
     43 
     44   bool Init();
     45   bool PrepareForeignSocket(base::ProcessHandle process_handle,
     46                             base::SyncSocket::TransitDescriptor* descriptor);
     47 
     48  private:
     49   base::SharedMemory* shared_memory_;
     50   uint32 shared_memory_segment_size_;
     51   uint32 shared_memory_segment_count_;
     52   uint32 current_segment_id_;
     53 
     54   // Socket for transmitting audio data.
     55   scoped_ptr<base::CancelableSyncSocket> socket_;
     56 
     57   // Socket to be used by the renderer. The reference is released after
     58   // PrepareForeignSocketHandle() is called and ran successfully.
     59   scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
     60 
     61   // The time of the creation of this object.
     62   base::Time creation_time_;
     63 
     64   // The time of the last Write call.
     65   base::Time last_write_time_;
     66 
     67   // Size in bytes of each audio bus.
     68   const int audio_bus_memory_size_;
     69 
     70   // Vector of audio buses allocated during construction and deleted in the
     71   // destructor.
     72   ScopedVector<media::AudioBus> audio_buses_;
     73 
     74   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
     75 };
     76 
     77 }  // namespace content
     78 
     79 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
     80